GNUplot with sixel support
On debian, just use these binaries (gnuplot backported from debian testing) or make your own using the attached patch or by adding to debian rules "--with-bitmap-terminals" right after --with-gd, so that debian/rules looks like:
--with-gd --with-bitmap-terminals \
Then set GNUTERM, like:
export GNUTERM="sixelgd size 1280,720 truecolor font arial 10"
You can mix regular images, ANSI colors and plot of function
This is what you can get, for example a visualization of chrony statistics.log wit the sixel-plot.sh script shown above:
It works inside GNU screen or tmux when using the proper patches: